Tool 01 — Estimator

ONE-REPMAX.

Two formulas, one clean set. Estimate the max, then take the percentage table to the rack.

EPLEYBRZYCKILB / KGNO SIGN-UP

The calculator

RUN IT.

Units

Weight lifted (lb)

Reps completed (1–12)

Estimates only — ask a coach before maxing out. Use a clean set, not one that stopped well short of effort.

Estimated one-rep max · Epley

265lb

Brzycki estimate: 255 lb
Based on 225 lb × 5 reps

95%250 lb

90%235 lb

85%225 lb

80%210 lb

75%195 lb

70%185 lb

65%170 lb

60%160 lb

The method

Epley and Brzycki both extrapolate from a submaximal set. They drift apart as reps climb, which is why both are shown.

01Epleyweight × (1 + reps ÷ 30)

02Brzyckiweight × 36 ÷ (37 − reps)

03Rep range1–12. Three to eight is the most practical window.

Use it in the room

A drop-in is $25 and covers full gym access for the day. Test the numbers with the Arsenal equipment in front of you.